Sure, but that's precisely the point of this comparison. 3G speeds blow Edge out of the water. There is no question. Most current 3G enabled phones are unable to render pages efficiently and usably, which reduces their overall usefulness. My previous Samsung Blackjack had 3G. 3G noticeably improved the speed at which things load, but it was still slow. To really utilize 3G's potential, I had to plug my laptop in. Once I did that, it was similar to using a wifi connection.
Overall, despite having a pokey EDGE connection, the iPhone pulls off a relatively pleasant browsing experience. I suspect the performance of a 3G iPhone will be very simliar to using the iPhone on a wifi network